SYMPOSIA PAPER Published: 01 January 1997
STP19936S

Fracture Analysis of Internally Delaminated Unsymmetric Laminated Composite Plates

Source

A sublaminate analysis is used to develop an analytical solution that determines the effect of midplane internal delamination on unsymmetric elastically tailored laminated plates. A displacement field that recognizes transverse shear deformation is proposed, and an elasticity boundary value problem is developed. A force-deformation relationship for the delaminated plate is derived. A change in total strain energy release rate and extension-twist coupling with crack length is calculated. The distribution of interlaminar shear and peel stresses on the interface containing the delamination is determined. The analysis is applied to a class of hygrothermally stable unsymmetric laminates under uniform extension. Results show that extension-twist coupling decays monotonically and total strain energy release rate increases monotonically, respectively, with delamination width. Interlaminar shear and peel stress are shown to be of larger magnitude at the free edge than at the delamination tip. The variation of extension-twist coupling with delamination width was verified experimentally. Test results indicate that for the cases under consideration, Teflon FEP film is inadequate for the simulation of internal delamination.

Author Information

Palmer, DW
Georgia Institute of Technology, School of Aerospace Engineering, Atlanta, GA
Armanios, EA
Georgia Institute of Technology, School of Aerospace Engineering, Atlanta, GA
Hooke, DA
Georgia Institute of Technology, School of Aerospace Engineering, Atlanta, GA
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: D30
Pages: 343–363
DOI: 10.1520/STP19936S
ISBN-EB: 978-0-8031-5353-0
ISBN-13: 978-0-8031-2411-0